Up Ragweed pith Primary pit fields Primary pit fields Wall, face view Nucleate cells Compact parenchyma Sclerenchyma Intercellular spaces Leaf, xs Chlorenchyma Shoot tip, ls Apical meristem Vascular cambium Secretory duct Resin canal Clusia duct Root cortex Leaf aerenchyma Air chambers Air chambers Aerenchyma, Acorus Stellate cells Epidermis Endodermis Phloem, ls Phloem, xs Transfer cells Bean cotyledon Acorn, starch Potato starch Ice plant cell Tannin cell Small cells
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Fig.
3.5-1. Longitudinal section of stem of milkweed (Asclepias).
The long, wide cell in the center of the micrograph (marked by arrows) is a sieve tube member, one
of the types of conducting parenchyma cells of phloem.
Notice that both of its end walls are slightly tilted. This type of parenchyma
is covered in more detail in Chapter 8 in Plant Anatomy (Mauseth).
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